Phase composition of frozen montmorillonite-water mixtures from heat capacity measurements
By: by Duwayne M. Anderson
Contributors: Cold Regions Research and Engineering Laboratory (U.S.)
Series: Research report -- 218; Research report (Cold Regions Research and Engineering Laboratory (U.S.)) -- 218
Publisher: U.S. Army Materiel Command, Cold Regions Research & Engineering Laboratory
Published: 1967
Place of publication: Hanover, N.H
Language: eng
Number of pages: 10
Subjects: Montmorillonite; Thermal properties; Ice; Soil freezing; Clay soils; Permeability; Frozen ground
Description: Equations are presented which form the basis of a method for determining the unfrozen water content of frozen clay-water mixtures from heat capacity measurements. The heat capacity of frozen sodium-montmorillonite water mixtures was determined at -4.7 and -9.6C with a Calvet Microcalorimeter. The data were then used in conjunction with the method described to obtain the unfrozen water content of these clay water mixtures. The data obtained indicate that the method is applicable at temperatures below about -5C. The amount of unfrozen water found in the frozen clay-water mixtures at -5 to -10C is equivalent to an interfacial surface layer of water of from one to two molecular diameters in thickness. Most of this water can be accommodated and is thought to be located in interlamellar regions. (Author).
Notes: "May 1967."

"DA task IVO14501B52A02."

Includes bibliographical references (p. 9-10).